From dd1ef00c45ba99ea10082f913c20319b1951defe Mon Sep 17 00:00:00 2001
From: Joern Rennecke <joern.rennecke@embecosm.com>
Date: Fri, 28 May 2021 07:29:53 +0100
Subject: [PATCH] Fix bug in the define_subst handling that made match_scratch
 unusable for multi-alternative patterns.

2021-05-28  Joern Rennecke  <joern.rennecke@embecosm.com>

gcc/
	* gensupport.c (alter_constraints): Add MATCH_SCRATCH case.
---
 gcc/gensupport.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/gensupport.c b/gcc/gensupport.c
index e1ca06dbc1e..4022c661adb 100644
--- a/gcc/gensupport.c
+++ b/gcc/gensupport.c
@@ -1291,6 +1291,9 @@ alter_constraints (rtx pattern, int n_dup, constraints_handler_t alter)
     case MATCH_OPERAND:
       XSTR (pattern, 2) = alter (XSTR (pattern, 2), n_dup);
       break;
+    case MATCH_SCRATCH:
+      XSTR (pattern, 1) = alter (XSTR (pattern, 1), n_dup);
+      break;
 
     default:
       break;